function lazyLoadImage(delayTime) {
    setTimeout(function () {
    	var lazyImage = $('.lazy-img');
    	var item;
    	// 遍历lazy-img属性，获取data-src属性，并更新为src
    	lazyImage.each(function(){
    		item=$(this);
    		item.attr("src", item.attr("data-src"));
    	});
    }, delayTime);
}